Inducing Disorder in Order: Hierarchically Porous Covalent Organic Framework Nanostructures for Rapid Removal of Persistent Organic Pollutants
Inducing Disorder in Order: Hierarchically Porous Covalent Organic Framework Nanostructures for Rapid Removal of Persistent Organic Pollutants
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DOI：
10.1021/jacs.9b02706
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发表时间：
2019-05-08
影响因子：
15
通讯作者：
Banerjee, Rahul
中科院分区：
文献类型：
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作者：
Karak, Suvendu;Dey, Kaushik;Banerjee, Rahul
通过多孔材料进行快速扩散和传质的关键因素是能否获得完全可从其表面接触到的大开孔内部。然而，由于其高度堆积的性质，有序二维(2D)材料无法找到现实世界的适用性，因为很难利用其完整的结构，特别是内核。在这方面，由层状二维晶体构建的三维(3D)纳米结构可能被证明是有利的。然而，真正的挑战是培养一种具有有序气孔的多孔纳米结构，其中气孔被晶壁包围。在这里，一种简单而通用的原位气相发泡技术已经被用来解决这些主要问题。小苏打的使用导致了泡沫结晶过程中二氧化碳的持续起泡，从而在2D微晶的表面产生了涟漪和波动。在无序的3D结构中诱导有序的微孔协同地呈现了通过相互连接的孔隙网络的各种客体的快速扩散。层状多孔结构中的高密度缺陷有助于超快吸附(
The key factor responsible for fast diffusion and mass transfer through a porous material is the availability of a widely open pore interior having complete accessibility from their surface. However, because of their highly stacked nature, ordered two-dimensional (2D) materials fail to find real-world applicability, as it is difficult to take advantage of their complete structure, especially the inner cores. In this regard, three-dimensional (3D) nanostructures constructed from layered two-dimensional crystallites could prove to be advantageous. However, the real challenge is to cultivate a porous nanostructure with ordered pores where the pores are surrounded by crystalline walls. Herein, a simple yet versatile in situ gas-phase foaming technique has been employed to address these cardinal issues. The use of baking soda leads to the continuous effervescence of CO2 during the crystallization of foam, which creates ripples and fluctuations on the surface of the 2D crystallites. The induction of ordered micropores within the disordered 3D architecture synergistically renders fast diffusion of various guests through the interconnected pore network. The high-density defects in the hierarchically porous structure help in ultrafast adsorption (